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HDR Help

  • 24-05-2011 4:22pm
    #1
    Gone Fishin
    Registered Users, Registered Users 2 Posts: 160 ✭✭


    Dear All,

    I am just wondering how I save a RAW image as a different image exposed differently. For example I want to process a HDR image, the original I want to use is in RAW but I want to create a version of it at -1 stop and another version at +1 stop. The only way I can figure out is to open the raw image in Photoshop elements, Camera RAW opens up. Do I just change the exposure settings in Camera RAW to -1 and save it and then do the same for +1 and save it. Do I need to change the EXIF info or will it do that itself? I use Picturenaut for processing RAW.

    Many thanks for your help.

    GF.


Comments

  • #2
    PopeBuckfastXVI
    Registered Users, Registered Users 2 Posts: 5,155 ✭✭✭PopeBuckfastXVI


    Yes, use the RAW to produce 3 jpegs, one under by one stop, and one over.

    To create a true HDR you should have taken 3 (or more) photos of the same scene at varying exposures, in order to capture the original dynamic range of the scene.


  • #3
    Gone Fishin
    Registered Users, Registered Users 2 Posts: 160 ✭✭Gone Fishin


    Great stuff. Thanks for your help.


  • #4
    CabanSail
    Moderators, Category Moderators, Arts Moderators, Entertainment Moderators Posts: 9,047 CMod ✭✭✭✭CabanSail


    If you are only shifting +/- 1 stop I doubt you need to go to the bother. You should be able to get that from the one RAW conversion.


  • #5
    samhail
    Registered Users, Registered Users 2 Posts: 2,699 ✭✭✭samhail


    Can't HDR tools take the raw file as an input


  • #6
    Gone Fishin
    Registered Users, Registered Users 2 Posts: 160 ✭✭Gone Fishin


    Cabansail/Samhail, HDR tools can take the RAW image. What do you mean when you say you can get that from the one RAW conversion? When I open the RAW image in photoshop, Camera RAW opens up first and there is an option to adjust the exposure of the image and then save it, if I just save it as another file name, I keep my original. I can save it as RAW, Is that what you mean?


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  • #7
    CabanSail
    Moderators, Category Moderators, Arts Moderators, Entertainment Moderators Posts: 9,047 CMod ✭✭✭✭CabanSail


    Gone Fishin wrote: »
    Cabansail/Samhail, HDR tools can take the RAW image. What do you mean when you say you can get that from the one RAW conversion? When I open the RAW image in photoshop, Camera RAW opens up first and there is an option to adjust the exposure of the image and then save it, if I just save it as another file name, I keep my original. I can save it as RAW, Is that what you mean?

    You can never edit a RAW file. It is just a set of data. You edit the way it's interpreted. So if you open it at default, 0 stops, you can get one image. Then reduce it to say -3 Stops and open another & then +3 Stops for a third. These can then then all be copied into one image as layers and then combined. There should be at least ±1 Stop of Dynamic Range in the single conversion though.


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